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Technical Briefs

A Versatile Cam Profile for Controlling Interface Force in Multiple-Dwell Cam-Follower Systems

[+] Author and Article Information
Forrest W. Flocker

Department of Engineering and Technology,  University of Texas of the Permian Basin, 4901 E. University, Odessa, TX 79762flocker_f@utpb.edu

J. Mech. Des 134(9), 094501 (Aug 06, 2012) (6 pages) doi:10.1115/1.4007146 History: Received February 08, 2011; Revised July 08, 2012; Published August 06, 2012; Online August 06, 2012

Cam follower systems are widely used in manufacturing because of their precise motion and ability to easily dwell. The cam typically drives a follower in some precise motion needed to accomplish a manufacturing task. Presented in this paper is a closed-form modified trapezoidal cam motion function with adjustable positive and negative acceleration. The profile is suitable for multiple-dwell cam and follower applications. The profile is particularly applicable to high-speed cams in which the follower acceleration is a primary design objective. The main benefit of the profile is that it allows cam designers to easily set limits on the positive and negative acceleration to achieve design objectives. Additional benefits are that the cycle jerk is continuous and that the cam designer can control the maximum magnitude of jerk. The motion program is presented in closed-form for easy implementation in standard equation-solver or spreadsheet software. Dynamic and harmonic analyses are presented to illustrate the benefits of the profile.

FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A typical cam-follower arrangement

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Figure 2

A typical double-dwell motion program

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Figure 3

Typical follower acceleration during the rise segment

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Figure 4

Follower pseudoacceleration for the example motion program

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Figure 5

Follower position for the example motion program

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Figure 6

Effect of the amplitude ratio R on the follower position during rise

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Figure 7

Effect of the amplitude ratio R on the follower velocity during rise

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Figure 8

Effect of the amplitude ratio R on the follower acceleration during rise

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Figure 9

Effect of the jerk control parameter n on the follower acceleration during rise

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Figure 10

Schematic of a double-dwell cam-follower system moving a load

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Figure 11

Follower acceleration for two jerk levels

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Figure 12

Comparison of low frequency acceleration components

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Figure 13

Comparison of high frequency acceleration components

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